Created for Windows by Cerulean Studios that can connect multiple IM programs.

This screen shot shows options are customizable in this section but they're turned on by default.

Über Trillian

Trillian is a multi protocol instant messaging application for Windows created by Cerulean Studios that can connect to multiple IM programs from one client, such as AIM, ICQ, MSN Messenger, Yahoo! Messenger, IRC, Novell GroupWise Messenger, Bonjour, and Jabber and Skype networks (the latter four with Trillian Pro which allows for additional plug-ins).

Initially released July 1, 2000 as a freeware IRC client, the first commercial version (Trillian Pro 1.0) was published on September 10, 2002. Trillian's creators have promised to continue to support and maintain a free version of Trillian, and it will remain a closed-source application.